“If you’re living a normal life,” Thornhill [the start-up's co-founder] reassures me, “then, frankly, you have nothing to worry about.”

That's a truly horrible justification of an invasive, creepy service. Who defines 'normal'? What's the scoring criteria?

I've got a mortgage on my flat, but if I were renting, I wouldn't rent any landlord using this start-up. Being sent this request by them would instantly signal to me that they're not the kind of landlord from whom any sane, reasonable person should rent if they have any other choice.

I sincerely hope this start-up fails and that Thornhill and his other co-founder/s come to realise that their idea is deeply invasive and shits all over a large part of society who are less fortunate than they.